eatures: 5 Digits LCD Display contact & non contact laser type bath Tachometer contact Range 0.5 to 19999 RPM (m/min) Non contact Range 2.5 to 99999 RPM Basic function : Range Detector type laser contact Combo Speed Measure Range 2.5~999.9 1000~99999 Speed Line Measure Range 0.05~99.99 100.0 More Resolution 0.1RPM/1RPM 0.01M/min, 0.1M/min Accuracy ±(0.05%+1d) Laser/photoelectric Measure Range 5cm~60cm Express function : Display 5 digital LCD display, the subtitles 10mm Max/Min/last data refer Yes Auto power off Yes General Features : Standard Accessory User's Manual,Gift box, reflective paper (9 centimeters x2), tapered adapter, funnel-shaped adapter, wire- speed ferry. Battery Type AA1.5V×4